import fs from 'fs';
const readStream = fs.createReadStream('./aaa.txt', {
    start: 8, 
    end: 22, 
    highWaterMark: 3
    });
    
    readStream.on('data', (data) => {
        console.log(data.toString());
        readStream.pause(); 
        setTimeout(() => {
        readStream.resume(); 
        }, 2000); 
        });